I understand that I can do this by manually entering the ticker symbols:
But is it not possible to do this automatically while the simulation is running, either by adjusting the buying rules or correcting the universe?
I saw the solutions here: Returns trimming/winsorizing and negative universe returns, either by removing top performers (and as I understand the post was not the best approach) or trimming using "Elliptical trimming," which I understand is done afterward in Excel.
Are there any other simpler solutions that can be used directly during backtesting?